San Francisco International Airport is planning to give guilt-ridden travelers a chance to offset the air pollution emitted from their plane rides.

The airport says it will set up a series of kiosks that will allow travelers to purchase certified carbon offsets. The city of San Francisco, the airport and a carbon-reduction investment company, 3Degrees, plans to roll out a pilot program this spring.

Travelers will enter their destination into the kiosk, which will calculate the amount of carbon dioxide for which they are responsible, and the cost of offsetting it. After swiping their credit cards, they would get a receipt listing the exact carbon-reducing projects their money went to.